DE10114368A1 - Yarn feed and guide to a texturizing machine has a linear drive for the yarn guide with a pneumatic piston/cylinder unit giving a small and even oscillation to move the yarn over the feed roller length for consistent roller wear - Google Patents

Abstract

To feed a running yarn to a textile machine, and especially a texturizing machine, a yarn guide leads to the yarn to a carrier roller where the yarn passes around it. The yarn guide is at a gap from the roller, and is given an oscillating movement across the line of yarn travel by a reversible linear drive. The linear drive, for the yarn guide and feed at a texturizing machine, is a pneumatic piston/cylinder unit, with a reciprocating piston (10) moving within a cylinder (8) with a hydraulic stroke damping through the mounting of the yarn guide at the piston rod (9), to give a slow and equal guide movement speed in both directions. The piston has two flexible displacement bodies (11,12) to form the hydraulic stroke damping. At one end, they face a common dividing wall (13) in the cylinder, so that each forms a compressed air chamber (16,18) and a damping chamber (17,19). The damping chambers are interconnected by a throttle drilling (20) and the compressed air chambers are filled alternately with compressed air. The throttle drilling through the dividing wall has an adjustment to set the flow cross section through it. The texturizing machine has at least one press roller at the circumference of the feed roller. The yarn moves between the two rollers in each position of the yarn guide. The feed roller can be a godet assembly with a deflection roller where the yarn runs over it, so that the yarn travels around both rollers in a number of windings in each position of the yarn guide. An Independent claim is included for a pneumatic piston/cylinder unit, with two displacement bodies as roll membranes, each secured by a holder (14,15) to the piston rod. The damping chambers are within the membranes, and the compressed air chambers are outside them. Preferred Features: The displacement bodies can be in the form of metal bellows, each closed by a plate at their free ends. The damping chambers are within the bellows, and the compressed air chambers are around them. The bellows are attached to the piston rod at their end plates. The throttle drilling through the dividing wall can be a ring gap between the piston rod and the dividing wall.

Description

The invention relates to a device for promoting and guiding a run the thread in the preamble of claim 1 and a piston-cylinder unit according to the preamble of claim 8.

Devices for conveying and guiding are known in texturing machines to use a running thread, for example from EP 0 641 877 is going on. A running thread is driven by a driven conveyor roller one processing station to the next. To slip the thread as possible To convey freely by means of the conveyor roller, it is known on the circumference of the conveyor roller zen at least one pressure roller or a belt run over two rollers to arrange so that the thread in the ge between the conveyor roller and pressure roller formed nip is promoted. It is also possible to use the conveyor roller to form by a godet with an assigned overflow roller, so that the thread with Multiple wrapping is promoted and managed.

In the known devices, the problem arises that the thread in its Direction of travel fixed within the texturing machine by stationary thread guides is. Thus, especially at the contact points between the current company Ver and the conveyor roller more or less depending on the surfaces signs of wear.

Accordingly, it is an object of the invention to provide a device for conveying and To continue guiding a running thread of the type mentioned at the beginning that that the entire available tread of the conveyor roller for  Guiding and promoting the thread can be used and a more even Wear takes place.

Another object of the invention is to provide a drive for a thread guide create a very slow and smooth movement.

The first part of the object is achieved by a device with the Features solved according to claim 1.

The second part of the task is in particular through the training of a pneumatic piston-cylinder unit according to the features of claim 8 solved.

Advantageous developments of the invention are defi in the dependent claims kidney.

The device according to the invention for the promotion and management of a running Fadens is particularly characterized in that a large area of the circumference surface can be used to promote the thread and thus a through Ver wear-related service life is increased many times over. For this, the in Thread running in front of the conveyor roller arranged in the thread guide moved essentially transversely to the thread running direction. The movement of the thread guide rers is carried out by a reversible linear drive. There with the point at which the thread runs onto the conveyor roller changes constantly. The during the movement of the thread contacted area of the circumference of the Conveyor roller is thus used evenly to convey and close the thread to lead.

In order to be undisturbed despite the transverse deflection of the thread by the thread guide To get ten quiet thread running, has the development of the device according to claim 2 particularly excellent. Here is a linear actuator  pneumatic piston-cylinder unit used, which a piston with hydrauli shear stroke damping. The particular advantage is that with Verwen an environmentally friendly pressure medium for actuating the piston cylinders unit a very slow and smooth movement can be carried out.

The development of the device according to the invention according to claim 3 verbes also ensures smooth running of the thread. The guide speed of the thread guide is regardless of the direction of movement the same, so that none through the thread guide treatment differences that arise, for example a texturing machine machine can occur.

The development of the invention according to claim 6 is particularly suitable to to guide several threads simultaneously by means of a conveyor roller. Here is in a pressure roller is provided for each processing point on the circumference of the conveyor roller, so that the thread in the nip between the pressure roller and the conveyor roller is guided. Each pairing between pressure roller and conveyor roller is one upstream oscillating driven thread guide. There is a possibility speed that the thread guides of the processing points arranged side by side as Group are driven by a linear actuator.

When using individually driven conveyor rollers, the execution of the Device according to the invention according to claim 7 is particularly preferred. Here the conveyor roller is a godet with an assigned overflow roller. The string is in each position of the thread guide with multiple wrapping over the Run godet and the overflow roller, so that the thread essentially without Hatching is encouraged.

To carry out the movement of the thread guide, in particular, invented piston cylinder unit according to the invention with the features of claim 8 draws. Due to the simple and compact design, this can be also driven in very inaccessible places within a texturing machine  put. The hydraulic stroke damping of the piston is achieved by two flexi ble displacer formed on the one hand the piston moving in the cylinder and on on the other hand, form the reservoir for a damping fluid. For this are the ousting ger with one end opposite to a common partition of the cylinder arranged horizontally. Inside the cylinder are displaced by the a compressed air chamber and a damping chamber are formed. The damping chambers are filled with the damping fluid and via a throttle bore connected with each other. The compressed air chambers inside the cylinder are off alternately fillable with compressed air, so that when compressed air is applied the Ver can be moved in the direction of movement within the cylinder. The particular advantage of the piston-cylinder unit according to the invention is that that the displacers have no significant pressure difference when loaded the pressurized air chamber and the adjacent damping chamber are exposed.

The displacers can be formed, for example, by two rolling membranes those that are attached to the piston rod with a holder. Are there the damping chambers within the rolling membrane and the compressed air chambers formed outside the rolling membrane. The piston rod that is in the partition and is guided in a cylinder wall, causes a smooth flexing movement the rolling membranes, so that no additional guide means are required.

It would also be possible to form the displacers by two metal bellows are each closed with a plate at the free ends, so that in the Damping chambers contain damping fluid during the movement of the Metal bellows is pushed back and forth between the damping chambers. Outside the metal bellows, the pressure chambers are inside the cylinder formed so that the compressed air introduced into the pressure chamber unmit acts directly on the metal bellows. One of the plates of the metal bellows is connected to the piston rod so that the movement of the metal bellows un is given indirectly to the outside. This training has the special  Advantage that no diffusion of air occurs on the displacer, so that during no significant change in the consistency of the Damping fluid occurs.

To keep the guiding speed of the executed movement as fine as possible To be able to set lig, the Kol Benzylindereinheit proposed to remove the throttle bore in the partition form and change in their free flow cross-section by an adjusting means to execute.

However, it is also possible to use a piston rod with two displacers is connected and thus penetrates the partition between the displacers, the throttle bore through an annular gap between the piston rod and the To form a partition.

An embodiment is shown below with reference to the accompanying Drawings described in more detail.

They represent:

Fig. 1 shows schematically an embodiment of a Vorrich device according to the invention for conveying and guiding a running thread;

Fig. 2 shows schematically a first embodiment of a pneumatic piston-cylinder unit according to the invention for moving a thread guide;

Fig. 3 schematically shows another embodiment of the pneumatic piston-cylinder unit according to the invention.

In Fig. 1, an embodiment of the device according to the invention for guiding and conveying a running thread is shown schematically. Here, a conveyor roller 2 is driven by a drive 4 with the direction of rotation directed in the direction of the thread. On the circumference of the conveyor roller 2 is a pressure roller 3 with a contact force. A thread 1 is guided in the nip between the conveyor roller 2 and the pressure roller 3 . A thread guide 6 is arranged at a distance from the feed roller 2 in the thread running direction. The yarn guide 6 is provided with a Li near drive-5 coupled to and substantially transversely reciprocated by the linear actuator 5 to the yarn path and brought hither. The linear drive 5 is designed as a Kol benzylinder unit 7 , on the piston rod 9 is attached to the free end of the thread guide 6 .

In the device shown in Fig. 1, the thread 1 is conveyed by the conveyor roller 2 and the adjacent pressure roller 3 evenly at a speed determined by the circumferential speed of the conveyor roller 2 . At the same time, the thread 1 is slowly moved back and forth by the thread guide 6 transversely to its thread running direction. The point at which the thread 1 hits the feed roller 2 changes . For this purpose, a second position of the thread guide 6 is shown in broken lines in FIG. 1. The deflection movement of the thread guide 6 is such that the circumferential region of the conveying roller 2 determined by the pressure roller 3 is essentially included to control the thread 1 . This ensures that the largest possible circumferential area of the conveyor roller can be used for conveying and guiding the thread.

In Fig. 2, a first embodiment of a pneumatic piston cylinder unit is shown schematically, such as would be used for example in the device in Fig. 1. The piston-cylinder unit shown in FIG. 2 is, however, also suitable for other applications in which a slow, uniform movement has to be carried out. The piston-cylinder unit consists of a cylinder 8 and a piston rod 9 which projects into the cylinder 8 from the outside and is connected to a piston 10 . The piston 10 is formed from two displacers 11 and 12 , which are designed as a rolling membrane. The United displacer 11 and 12 are arranged at one end on a partition 13 . The partition wall 13 divides the cylinder 8 into two halves. The displacers 11 and 12 face each other with their fastening ends. The rolling membrane 11 and 12 are hat-shaped. At the free end of the rolling membrane 11 , a Hal ter 14 is provided which connects the rolling membrane 11 with the piston rod 9 . On the opposite side of the partition 13 , the rolling membrane 12 is connected to the piston rod 9 by the holder 15 . The holders 14 and 15 are attached to the piston rod 9 . The piston rod 9 penetrates the dividing wall 13th An annular gap 20 is formed, which extends between the partition 13 and the piston rod 9 . In the left half of the cylinder 8 , a compressed air chamber 16 and a damping chamber 17 are formed by the rolling membrane 11 . The damping chamber 17 is formed within the rolling membrane 11 and is sealed off from the compressed air chamber 16 . On the right half, a second compressed air chamber 18 and a second damping chamber 19 are formed by the rolling membrane 12 . Here, too, the damping chamber 19 is sealed within the rolling membrane 12 from the compressed air chamber 18 .

The compressed air chamber 16 is connected via a connection 21 to a compressed air line. The compressed air chamber 18 is connected to a second compressed air line via the connection 22 . The compressed air lines can be alternately connected to a compressed air source via a control unit (not shown here). The damping chambers 16 and 17 formed within the rolling diaphragm 11 and 12 are connected to one another via the annular gap 20 . In the damping chambers 17 and 19 , a non-compressible damping fluid is filled. An oil is preferably used as the damping fluid.

In order to activate the piston-cylinder unit shown in FIG. 2, compressed air is introduced into one of the connections 21 or 22 . In the illustrated operation example 18 from compressed air is introduced into the port 22 into the compressed air chamber so that in the compressed air chamber 18 of the pressure rises and the rolling diaphragm 12 and is applied to the holder 15 °. The compressed air chamber 16 is relieved of the connection 21 , so that the rolling membrane 12 in the direction of the partition 13 is moved. The movement of the rolling membrane 12 is performed in dependency on the damping fluid displaced in the damping chamber 19 . The damping fluid enclosed in the damping chamber reaches the adjacent damping chamber 17 via the annular gap 20 . As a result, the rolling membrane 11 is moved away from the partition 13 . The volume of the damping chamber 17 increases by the amount by which the volume of the damping chamber 19 decreases. The piston rod 9 is drawn into the cylinder 8 . This movement is carried out up to a stop. As an example, the stop is formed by the partition 13 and the holder 15 .

To reverse the direction of movement of the piston rod 9 , the compressed air chamber 18 is relieved via the connection 22 , and at the same time via the connection 21 to the compressed air chamber 16 compressed air is supplied. Thus, the movement of the rolling diaphragm 11 and the rolling diaphragm 12 is reversed so that the damping fluid flows from the damping chamber 17 into the damping chamber 19 . The piston rod 9 moves out of the cylinder 8 .

In Fig. 3, another embodiment of a piston-cylinder unit according to the invention is shown schematically. The components with the same function were given identical reference numbers. The embodiment in Fig. 3 is substantially identical to the game shown in Fig. 2 game. In this respect, only the differences are described below, and reference is made to the previous description of FIG. 2.

In the piston-cylinder unit shown in FIG. 3, the cylinder 8 is divided into two halves by a partition 13 . The piston 10 is formed by two displacers 23 and 24 , which are attached to the partition 13 opposite. The displacers 23 and 24 are designed as metal bellows, which are each closed at the free ends by the plates 25 and 26 . Thus, the damping chamber 17 is formed within the metal bellows 23 and the damping chamber 19 is formed within the metal bellows 24 . The piston rod ge 9 is firmly connected to the plate 26 of the metal bellows 24 . The piston rod 9 penetrates the end cylinder wall of the cylinder 8 in a pressure-tight manner and is guided over the metal bellows 24 and the cylinder wall.

In the partition 13 , a throttle bore 27 is introduced, which connects the damping chambers 17 and 19 to one another. In the throttle bore 27 projects an adjusting means 28 , through which the free flow cross section of the throttle bore 27 can be changed. Outside the metal bellows 23 , the compressed air chamber 16 and outside of the metal bellows 24, the compressed air chamber 18 is formed in the cylinder 8 . The compressed air chambers 16 and 18 can be acted upon by the connections 21 and 22 with compressed air and sealed against the damping chambers 17 and 19 . In the damping chambers 17 and 19, a damping fluid is filled, wherein the damping chambers 17 and 19 are connected to each other through the throttle bore 27th

The function of the piston-cylinder unit shown in FIG. 3 is identical to the previously shown exemplary embodiment according to FIG. 2. In this respect, reference is made to the previous description. In order to change the speed of the piston rod 9 during execution and insertion, the flow cross-section of the throttle bore 27 is increased or decreased by the adjusting means 28 . The throttle cross-section is reduced in order to maintain a slower speed. In order to obtain an increase in the guide speed of the piston rod, the flow cross section of the throttle bore 27 is increased. Since the flow of the damping fluid is changed from one damping chamber into the adjacent one and vice versa. Thus, a very sensitive adjustment of the guide speed of the piston rod 9 can be carried out .

The embodiment shown in Fig. 1 is exemplary in its structure. There is also the possibility of executing the device shown in FIG. 1 with a godet unit and an associated overflow roller. Here, too, the run-up point of the thread on the godet unit is constantly varied by the oscillating movement of the thread guide.

The illustrated embodiments of the piston-cylinder unit are also exemplary in their structure. Thus, the embodiment of FIG. 2 in the partition 13 could also contain a throttle bore, which is adjustable via a Ver adjusting means in their flow cross section. It is also possible to form the embodiment shown in FIG. 3 with a continuous piston rod which is guided both in the partition wall and in the cylinder wall. In addition to the roller membranes and metal bellows shown, fabric-reinforced membranes and bellows can also be used as displacers. It is essential here that the stroke movement of the piston is slowed down by the hy draulic damping.

Reference list

1

thread

2nd

Conveyor roller

3rd

Pressure roller

4

drive

5

linear actuator

6

Thread guide

7

Piston cylinder unit

8th

cylinder

9

Piston rod

10th

piston

11

Displacer, roll membrane

12th

Displacer, roll membrane

13

partition wall

14

holder

15

holder

16

Compressed air chamber

17th

Damping chamber

18th

Compressed air chamber

19th

Damping chamber

20th

Annular gap

21

Connection

22

Connection

23

Displacer, metal bellows

24th

Displacer, metal bellows

25th

plate

26

plate

27

Throttle bore

28

Adjusting means

Claims (12)

1. Device for conveying and guiding a running thread ( 1 ), in particular in a texturing machine, with a driven conveyor roller ( 2 ) which is at least partially wrapped around the thread ( 1 ) on the circumference, and with a thread guide ( 6 ), which is arranged at a distance in the thread path of the conveyor roller ( 2 ), characterized in that the thread guide ( 6 ) is designed to be oscillating substantially transversely to the thread running direction and that a re versibly operated linear drive ( 5 ) is provided for moving the thread guide ( 6 ) . 2. Device according to claim 1, characterized in that the linear drive ( 5 ) as a pneumatic piston-cylinder unit ( 7 ) is formed, which has a piston ( 10 ) movable in a cylinder ( 8 ) with a hydraulic lift damper. 3. Apparatus according to claim 2, characterized in that the stroke damping of the piston ( 10 ) is designed such that the with a piston rod ( 9 ) of the piston-cylinder unit ( 7 ) connected thread guide ( 6 ) in both directions of movement receives a slow equally large leadership speed. 4. Device according to one of claims 2 or 3, characterized in that the piston ( 10 ) has two flexible displacers ( 11 , 12 ) to form the hy draulic stroke damping that the displacer ( 11 , 12 ) with one end at a common Partition ( 13 ) of the cylinder ( 8 ) are arranged opposite one another, that a compressed air chamber ( 16 , 18 ) and a damping chamber ( 17 , 19 ) are formed by the displacers ( 11 , 12 ) that the damping chambers filled with a damping fluid ( 17 , 19 ) are connected to one another via a throttle bore ( 20 , 27 ) and that the compressed air chambers ( 16 , 18 ) can be alternately filled with compressed air. 5. The device according to claim 4, characterized in that the throttle bore ( 27 ) is formed in the partition ( 13 ) and is variable by an adjusting means ( 28 ) in its free flow cross section. 6. Device according to one of the preceding claims, characterized in that at least one pressure roller ( 3 ) abuts the circumference of the conveyor roller ( 2 ) and that the thread in any position of the thread guide ( 6 ) in a between the conveyor roller ( 2 ) and the pressure roller ( 3 ) formed nip is feasible. 7. Device according to one of claims 1 to 5, characterized in that the conveyor roller is a godet with an associated overflow roller, wherein the thread in any position of the thread guide with multiple wrapping can be guided over the godet and the overflow roller. 8. Pneumatic piston-cylinder unit, in particular for slow oszillie leaders driving a thread guide, with a guided within a cylinder (8) piston (10) with a hydraulic stroke damping and a connected to the piston (10) piston rod (9), characterized in that the piston ( 10 ) has two flexible displacers ( 11 , 12 ) to form the hydraulic stroke damping, that the displacers ( 11 , 12 ) are arranged opposite one another on a common partition ( 13 ) of the cylinder ( 8 ), that through the displacers ( 11 , 12 ) within the cylinder ( 8 ) each have a compressed air chamber ( 16 , 18 ) and a damping chamber ( 17 , 19 ) that the damping chambers filled with a damping fluid ( 17 , 19 ) via a throttle bore ( 20 , 27 ) are connected to each other and that the compressed air chambers ( 16 , 18 ) can be filled alternately with compressed air. 9. piston-cylinder unit according to claim 8, characterized in that the displacers are formed by two rolling membranes ( 11 , 12 ) which are each fastened to the piston rod ( 9 ) with a holder ( 14 , 15 ), wherein within the rolling membranes ( 11 , 12 ) the damping chambers ( 17 , 19 ) and outside the rolling membranes ( 11 , 12 ) the compressed air chambers ( 16 , 18 ) are formed. 10. Piston-cylinder unit according to claim 8, characterized in that the displacers are formed by two metal bellows ( 23 , 24 ) which are each closed with a plate ( 25 , 26 ) at the free ends, with within the metal bellows ( 23 , 24 ) the damping chambers ( 17 , 19 ) and outside the metal bellows ( 23 , 24 ) the compressed air chambers ( 16 , 18 ) are formed and wherein at least one of the plates ( 26 ) is connected to the piston rod ( 9 ). 11. Piston-cylinder unit according to one of claims 8 to 10, characterized in that the throttle bore ( 27 ) is formed in the partition ( 13 ) and is variable by an adjusting means ( 28 ) in its free flow cross section. 12. Piston-cylinder unit according to one of claims 8 to 11, characterized in that the throttle bore is formed by an annular gap ( 20 ) between the piston rod ( 9 ) and the partition ( 13 ).